SV-223353r961353: Outlook must be configured to prevent users overriding attachment security settings. | Microsoft Office 365 ProPlus STIG SCAP Benchmark

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Assessment Title

Rule Text

Outlook must be configured to prevent users overriding attachment security settings.

Description

Discussion Text

This policy setting prevents users from overriding the set of attachments blocked by Outlook. If you enable this policy setting users will be prevented from overriding the set of attachments blocked by Outlook. Outlook also checks the "Level1Remove" registry key when this setting is specified. If you disable or do not configure this policy setting, users will be allowed to override the set of attachments blocked by Outlook.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-002235SV-108885V-99781

References

DPMS Target Microsoft Office 365 ProPlus DISA DPMS Target Microsoft Office 365 ProPlus 4099

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_office_365_proplus target this check assesses.

# OVAL Definition: oval:mil.disa.stig.office365:def:223353
$compliant = Test-Path -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\Outlook\disallowattachmentcustomization" -and (Get-ItemProperty -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\Outlook" -Name "disallowattachmentcustomization" -ErrorAction SilentlyContinue).disallowattachmentcustomization -eq 1
if ($compliant) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Prevent users from customizing attachment security settings to "Enabled".